After going in 1-0 down at the half-time interval at Aldershot Town's Recreation Ground, following a goal from former Southend United and Southampton forward Matt Paterson early in the first half.
After returning to the dressing room at half-time, the Gloucestershire minnows returned to the field, producing a quick turnaround on their Hampshire hosts.
The visitors were awarded a penalty in the 52nd minute by referee Rob Whitton, and Duncan Culley stepped up confidently to convert, handing Shortwood a surprising equaliser after a challenging first half display.
Their second half performance went from good to great when just three minutes later, the Southern League outfit found themselves in the lead.
Midfielder Adam Mann stepped up to become the club's cup hero, slamming a long-range effort emphatically past Luke Williams in the Shots' goal.
The side from Nailsworth held on to confirm their place in the FA Cup First Round, where they will face League One side Port Vale, currently 9th and just two points off of the League One play-off spots.
Shortwood United, meanwhile, are 18th in The Calor League, consisting of 22 sides, having failed to win any of their last six league games. The club have amassed just nine points from the opening eight games of the season.
Port Vale will travel to Shortwood's Meadowbank home on Saturday the 9th of November, when the FA Cup's latest love interest will look to further cement their place in the history books.
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